var msg = ['userName','age','sex'];
var stdin = process.stdin;
var index = 0;
var infor = [];
console.log(msg[0]+':');

stdin.on('data',function(chunk){
    var str = chunk.toString('utf-8');
    infor[index]=str;
    index++;
    if(index==3){
        console.log(infor);
        process.exit();
    }
    console.log(msg[index]+':')
})